linux-imx

/*

 * IOMMU sysfs class support

 *

 * Copyright (C) 2014 Red Hat, Inc.  All rights reserved.

 *     Author: Alex Williamson <alex.williamson@redhat.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#include <linux/device.h>

#include <linux/iommu.h>

#include <linux/init.h>

#include <linux/slab.h>

​

/*

 * We provide a common class "devices" group which initially has no attributes.

 * As devices are added to the IOMMU, we'll add links to the group.

 */

static struct attribute *devices_attr[] = {

    NULL,

};

​

static const struct attribute_group devices_attr_group = {

    .name = "devices",

    .attrs = devices_attr,

};

​

static const struct attribute_group *dev_groups[] = {

    &devices_attr_group,

    NULL,

};

​

static void release_device(struct device *dev)

{

    kfree(dev);

}

​

static struct class iommu_class = {

    .name = "iommu",

    .dev_release = release_device,

    .dev_groups = dev_groups,

};

​

static int __init iommu_dev_init(void)

{

    return class_register(&iommu_class);

}

postcore_initcall(iommu_dev_init);

​

/*

 * Init the struct device for the IOMMU. IOMMU specific attributes can

 * be provided as an attribute group, allowing a unique namespace per

 * IOMMU type.

 */

int iommu_device_sysfs_add(struct iommu_device *iommu,

               struct device *parent,

               const struct attribute_group **groups,

               const char *fmt, ...)

{

    va_list vargs;

    int ret;

​

    iommu->dev = kzalloc(sizeof(*iommu->dev), GFP_KERNEL);

    if (!iommu->dev)

        return -ENOMEM;

​

    device_initialize(iommu->dev);

​

    iommu->dev->class = &iommu_class;

    iommu->dev->parent = parent;

    iommu->dev->groups = groups;

​

    va_start(vargs, fmt);

    ret = kobject_set_name_vargs(&iommu->dev->kobj, fmt, vargs);

    va_end(vargs);

    if (ret)

        goto error;

​

    ret = device_add(iommu->dev);

    if (ret)

        goto error;

​

    dev_set_drvdata(iommu->dev, iommu);

​

    return 0;

​

error:

    put_device(iommu->dev);

    return ret;

}